Bug 82610

Summary:	NFS locking unstable in linux 2.6.10-r6 kernel
Product:	Gentoo Linux	Reporter:	Logan Bowers <logan>
Component:	[OLD] Core system	Assignee:	Gentoo Kernel Bug Wranglers and Kernel Maintainers <kernel>
Status:	RESOLVED TEST-REQUEST
Severity:	normal
Priority:	High
Version:	unspecified
Hardware:	x86
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---

Description Logan Bowers 2005-02-19 14:12:37 UTC

If I use an initrd or other boot stage and pivot_root to mount root over NFS with locking (-o lock is default), the system will crash/kernel panic during boot.  Sometimes, it will even crash the server (also gentoo linux 2.6.10-r6).  

Reproducible: Always
Steps to Reproduce:
1. Copy an image of your linux system to an NFS server
1.1 Make a directory for pivot_root in the image (mkdir mnt/oldroot)
2. Boot client system straight to shell (init=/bin/sh on the kernel command line)
3. Start portmap (/sbin/portmap)
4. Start rpc.statd (/sbin/rpc.statd)
5. Mount the root filesystem (mount nfsserver:/path/to/root/image /mnt/root)
6. Pivot to the new system (cd /mnt/root;pivot_root . mnt/oldroot;exec chroot . /bin/sh)
7. Start normal boot process (exec /sbin/init <dev/console >dev/console 2>&1) 

Actual Results:  
Bang!  System will crash either when "calculating module dependencies" or after
"starting local".  

Expected Results:  
System should boot to command prompt normally.

Comment 1 Daniel Drake (RETIRED) gentoo-dev

2005-02-20 09:59:02 UTC

Which is the last good kernel that worked?

Comment 2 Logan Bowers 2005-02-20 12:03:21 UTC

A very long time ago I had a similar setup working under a 2.4 kernel, but I have not been able to make this work with any 2.6 kernel (starting around 2.6.8).

Comment 3 Daniel Drake (RETIRED) gentoo-dev

2005-03-14 09:07:18 UTC

Could you please try 2.6.11?

Comment 4 Daniel Drake (RETIRED) gentoo-dev

2005-04-01 03:09:50 UTC

Please reopen when you test the latest kernel.